Forge crashes on launch

[Darien Blaque]

Forge crashes on launch.
I receive the following error:
java.lang.NullPointerException: Cannot invoke "java.util.HashMap.keySet()" because the return value of "java.util.HashMap.get(Object)" is null
at forge.deck.CommanderDeckGenerator.getCommanderDecks(CommanderDeckGenerator.java:30)
at forge.gamemodes.quest.QuestEventCommanderDuelManager.assembleDuels(QuestEventCommanderDuelManager.java:46)
at forge.gamemodes.quest.QuestEventCommanderDuelManager.<init>(QuestEventCommanderDuelManager.java:37)
at forge.gamemodes.quest.QuestController.resetDuelsManager(QuestController.java:455)
at forge.gamemodes.quest.QuestController.load(QuestController.java:254)
at forge.control.FControl.initialize(FControl.java:234)
at forge.view.Main.main(Main.java:60)

Any assistance in this matter would be greatly appreciated.